Sizes disappear from dropdown in frontend after I disable an Virtual Product

I have a problem and I dont’t know the cause. I use Magento 2.3.4.

Problem description:

I created an cofigurable product with more sizes and I tryed to disable or remove an “Virtual product” because i don’t need those sizes.
After I disable an product another sizes disappear from dropdawn list in frontend even if they are enable and is in stock.

I attached 2 images to be easier to see where is the problem. - before disabled the product - after I disabled the product

Thank you! And sorry if my english is not so good :D.

What relation does the Configurable Product have with the Product you are referring to? I’m just trying to understand what one thing has to do with the other.